An arrest warrant will soon be issued for a Dallas police officer who shot and killed a man upon returning home from her shift and entering an apartment she apparently thought was her own, police said Friday.

Dallas Police Chief Renee Hall announced at a press conference that authorities are in the process of obtaining a warrant for the officer involved, who has not yet been identified.

"At the very early stages of this investigation, initial indications were that they were what we consider circumstances of an officer-involved shooting," Hall told reporters. "However, as we continued this investigation it became clear that we were dealing with what appears to be a much different and very unique situation."

Preliminary information suggests the off-duty officer was still wearing her police uniform after working a full shift when she arrived at the apartment complex where she lives south of downtown Dallas on Thursday night. That's when she walked into "what she believed to be her apartment," the police chief said.

The officer, who is white, "encountered" Jean, who was black, inside the apartment. It's unclear what the interaction was between them, but at some point she "fired her weapon, striking the victim," according to Hall.

The officer called 911 for help, and the responding officers administered aid to Jean at the scene. He was then taken to a local hospital, where he later died, the police chief said.

Jean was a 2016 graduate of Harding University in Arkansas, where he "frequently led worship for chapel and for campus events," according to a statement from the school.

The university said Jean was originally from Saint Lucia, an island nation in the Caribbean.

"The entire Harding family grieves today for the loss of Botham Jean, who has meant so very much to us," the statement said in part.

At the time of his death, he was working for PricewaterhouseCoopers, a multinational professional services firm with an office in Dallas.

"This is a terrible tragedy. Botham Jean was a member of the PwC family in our Dallas office and we are simply heartbroken to hear of his death," the company said in a statement obtained by ABC News on Friday.

PHOTO: Botham Jean is seen leading worship at a university presidential reception in Dallas, Sept. 21, 2017. (Jeff Montgomery/Harding University/AP)

The officer involved was not injured in the incident and was placed on administrative leave while the police department conducted a joint investigation with the Dallas County District Attorney's Office into what they initially thought was an officer-involved shooting, Hall said.

The Dallas Police Department has since ceased handling the incident under its "normal officer-involved shooting protocol" and has invited the Texas Rangers to conduct an independent investigation. A blood sample was also taken from the officer to test for drugs and alcohol, Hall said.

The Dallas police chief said she's spoken to Jean's family to express her condolences and reassure them investigators are working "diligently" on the case.

"Right now there are more questions than answers. We understand the concerns of the community," Hall told reporters Friday afternoon. "That is why we are working as vigorously and meticulously as we can to ensure the integrity of the case and the department is upheld. In doing so, we hope to bring understanding to the family."